/**用法
 * Lunar.toSolar(2016, 6, 3); 农历转化公历
 * Lunar.toLunar(2016, 7, 6); 公历转化农历
 */
var Lunar = {
  MIN_YEAR: 1891,
  MAX_YEAR: 2100,
  lunarInfo: [
    [0, 2, 9, 21936], [6, 1, 30, 9656], [0, 2, 17, 9584], [0, 2, 6, 21168], [5, 1, 26, 43344], [0, 2, 13, 59728],
    [0, 2, 2, 27296], [3, 1, 22, 44368], [0, 2, 10, 43856], [8, 1, 30, 19304], [0, 2, 19, 19168], [0, 2, 8, 42352],
    [5, 1, 29, 21096], [0, 2, 16, 53856], [0, 2, 4, 55632], [4, 1, 25, 27304], [0, 2, 13, 22176], [0, 2, 2, 39632],
    [2, 1, 22, 19176], [0, 2, 10, 19168], [6, 1, 30, 42200], [0, 2, 18, 42192], [0, 2, 6, 53840], [5, 1, 26, 54568],
    [0, 2, 14, 46400], [0, 2, 3, 54944], [2, 1, 23, 38608], [0, 2, 11, 38320], [7, 2, 1, 18872], [0, 2, 20, 18800],
    [0, 2, 8, 42160], [5, 1, 28, 45656], [0, 2, 16, 27216], [0, 2, 5, 27968], [4, 1, 24, 44456], [0, 2, 13, 11104],
    [0, 2, 2, 38256], [2, 1, 23, 18808], [0, 2, 10, 18800], [6, 1, 30, 25776], [0, 2, 17, 54432], [0, 2, 6, 59984],
    [5, 1, 26, 27976], [0, 2, 14, 23248], [0, 2, 4, 11104], [3, 1, 24, 37744], [0, 2, 11, 37600], [7, 1, 31, 51560],
    [0, 2, 19, 51536], [0, 2, 8, 54432], [6, 1, 27, 55888], [0, 2, 15, 46416], [0, 2, 5, 22176], [4, 1, 25, 43736],
    [0, 2, 13, 9680], [0, 2, 2, 37584], [2, 1, 22, 51544], [0, 2, 10, 43344], [7, 1, 29, 46248], [0, 2, 17, 27808],
    [0, 2, 6, 46416], [5, 1, 27, 21928], [0, 2, 14, 19872], [0, 2, 3, 42416], [3, 1, 24, 21176], [0, 2, 12, 21168],
    [8, 1, 31, 43344], [0, 2, 18, 59728], [0, 2, 8, 27296], [6, 1, 28, 44368], [0, 2, 15, 43856], [0, 2, 5, 19296],
    [4, 1, 25, 42352], [0, 2, 13, 42352], [0, 2, 2, 21088], [3, 1, 21, 59696], [0, 2, 9, 55632], [7, 1, 30, 23208],
    [0, 2, 17, 22176], [0, 2, 6, 38608], [5, 1, 27, 19176], [0, 2, 15, 19152], [0, 2, 3, 42192], [4, 1, 23, 53864],
    [0, 2, 11, 53840], [8, 1, 31, 54568], [0, 2, 18, 46400], [0, 2, 7, 46752], [6, 1, 28, 38608], [0, 2, 16, 38320],
    [0, 2, 5, 18864], [4, 1, 25, 42168], [0, 2, 13, 42160], [10, 2, 2, 45656], [0, 2, 20, 27216], [0, 2, 9, 27968],
    [6, 1, 29, 44448], [0, 2, 17, 43872], [0, 2, 6, 38256], [5, 1, 27, 18808], [0, 2, 15, 18800], [0, 2, 4, 25776],
    [3, 1, 23, 27216], [0, 2, 10, 59984], [8, 1, 31, 27432], [0, 2, 19, 23232], [0, 2, 7, 43872], [5, 1, 28, 37736],
    [0, 2, 16, 37600], [0, 2, 5, 51552], [4, 1, 24, 54440], [0, 2, 12, 54432], [0, 2, 1, 55888], [2, 1, 22, 23208],
    [0, 2, 9, 22176], [7, 1, 29, 43736], [0, 2, 18, 9680], [0, 2, 7, 37584], [5, 1, 26, 51544], [0, 2, 14, 43344],
    [0, 2, 3, 46240], [4, 1, 23, 46416], [0, 2, 10, 44368], [9, 1, 31, 21928], [0, 2, 19, 19360], [0, 2, 8, 42416],
    [6, 1, 28, 21176], [0, 2, 16, 21168], [0, 2, 5, 43312], [4, 1, 25, 29864], [0, 2, 12, 27296], [0, 2, 1, 44368],
    [2, 1, 22, 19880], [0, 2, 10, 19296], [6, 1, 29, 42352], [0, 2, 17, 42208], [0, 2, 6, 53856], [5, 1, 26, 59696],
    [0, 2, 13, 54576], [0, 2, 3, 23200], [3, 1, 23, 27472], [0, 2, 11, 38608], [11, 1, 31, 19176], [0, 2, 19, 19152],
    [0, 2, 8, 42192], [6, 1, 28, 53848], [0, 2, 15, 53840], [0, 2, 4, 54560], [5, 1, 24, 55968], [0, 2, 12, 46496],
    [0, 2, 1, 22224], [2, 1, 22, 19160], [0, 2, 10, 18864], [7, 1, 30, 42168], [0, 2, 17, 42160], [0, 2, 6, 43600],
    [5, 1, 26, 46376], [0, 2, 14, 27936], [0, 2, 2, 44448], [3, 1, 23, 21936], [0, 2, 11, 37744], [8, 2, 1, 18808],
    [0, 2, 19, 18800], [0, 2, 8, 25776], [6, 1, 28, 27216], [0, 2, 15, 59984], [0, 2, 4, 27424], [4, 1, 24, 43872],
    [0, 2, 12, 43744], [0, 2, 2, 37600], [3, 1, 21, 51568], [0, 2, 9, 51552], [7, 1, 29, 54440], [0, 2, 17, 54432],
    [0, 2, 5, 55888], [5, 1, 26, 23208], [0, 2, 14, 22176], [0, 2, 3, 42704], [4, 1, 23, 21224], [0, 2, 11, 21200],
    [8, 1, 31, 43352], [0, 2, 19, 43344], [0, 2, 7, 46240], [6, 1, 27, 46416], [0, 2, 15, 44368], [0, 2, 5, 21920],
    [4, 1, 24, 42448], [0, 2, 12, 42416], [0, 2, 2, 21168], [3, 1, 22, 43320], [0, 2, 9, 26928], [7, 1, 29, 29336],
    [0, 2, 17, 27296], [0, 2, 6, 44368], [5, 1, 26, 19880], [0, 2, 14, 19296], [0, 2, 3, 42352], [4, 1, 24, 21104],
    [0, 2, 10, 53856], [8, 1, 30, 59696], [0, 2, 18, 54560], [0, 2, 7, 55968], [6, 1, 27, 27472], [0, 2, 15, 22224],
    [0, 2, 5, 19168], [4, 1, 25, 42216], [0, 2, 12, 42192], [0, 2, 1, 53584], [2, 1, 21, 55592], [0, 2, 9, 54560]
  ],
  //是否闰年
  isLeapYear: function (year) {
    return ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0));
  },
  //天干地支年
  lunarYear: function (year) {
    var gan = ['庚', '辛', '壬', '癸', '甲', '乙', '丙', '丁', '戊', '己'],
      zhi = ['申', '酉', '戌', '亥', '子', '丑', '寅', '卯', '辰', '巳', '午', '未'],
      str = year.toString().split("");
    return gan[str[3]] + zhi[year % 12];
  },
  //生肖年
  zodiacYear: function (year) {
    var zodiac = ['猴', '鸡', '狗', '猪', '鼠', '牛', '虎', '兔', '龙', '蛇', '马', '羊'];
    return zodiac[year % 12];
  },
  //公历月份天数
  //@param year 阳历-年
  //@param month 阳历-月
  solarMonthDays: function (year, month) {
    var FebDays = this.isLeapYear(year) ? 29 : 28;
    var monthHash = ['', 31, FebDays, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
    return monthHash[month];
  },
  //农历月份天数
  lunarMonthDays: function (year, month) {
    var monthData = this.lunarMonths(year);
    return monthData[month - 1];
  },
  //农历月份天数数组
  lunarMonths: function (year) {
    var yearData = this.lunarInfo[year - this.MIN_YEAR];
    var leapMonth = yearData[0];
    var bit = (+yearData[3]).toString(2);
    var months = [];
    for (var i = 0; i < bit.length; i++) {
      months[i] = bit.substr(i, 1);
    }

    for (var k = 0, len = 16 - months.length; k < len; k++) {
      months.unshift('0');
    }

    months = months.slice(0, (leapMonth == 0 ? 12 : 13));
    for (var i = 0; i < months.length; i++) {
      months[i] = +months[i] + 29;
    }
    return months;
  },
  //农历每年的天数
  //@param year 农历年份
  lunarYearDays: function (year) {
    var monthArray = this.lunarYearMonths(year);
    var len = monthArray.length;
    return (monthArray[len - 1] == 0 ? monthArray[len - 2] : monthArray[len - 1]);
  },
  //
  lunarYearMonths: function (year) {
    var monthData = this.lunarMonths(year);
    var res = [];
    var temp = 0;
    var yearData = this.lunarInfo[year - this.MIN_YEAR];
    var len = (yearData[0] == 0 ? 12 : 13);
    for (var i = 0; i < len; i++) {
      temp = 0;
      for (j = 0; j <= i; j++) {
        temp += monthData[j];
      }
      res.push(temp);
    }
    return res;
  },
  //获取闰月
  //@param year 农历年份
  leapMonth: function (year) {
    var yearData = this.lunarInfo[year - this.MIN_YEAR];
    return yearData[0];
  },
  //计算农历日期与正月初一相隔的天数
  betweenLunarDays: function (year, month, day) {
    var yearMonth = this.lunarMonths(year);
    var res = 0;
    for (var i = 1; i < month; i++) {
      res += yearMonth[i - 1];
    }
    res += day - 1;
    return res;
  },
  //计算2个阳历日期之间的天数
  //@param year 阳历年
  //@param month
  //@param day
  //@param l_month 阴历正月对应的阳历月份
  //@param l_day   阴历初一对应的阳历天
  betweenSolarDays: function (year, month, day, l_month, l_day) {
    var time1 = new Date(year + "-" + month + "-" + day).getTime(),
      time2 = new Date(year + "-" + l_month + "-" + l_day).getTime();
    return Math.ceil((time1 - time2) / 24 / 3600 / 1000);
  },
  //根据距离正月初一的天数计算阴历日期
  //@param year 阳历年
  //@param between 天数
  lunarByBetween: function (year, between) {
    var lunarArray = [], yearMonth = [], t = 0, e = 0, leapMonth = 0, m = '';
    if (between == 0) {
      t = 1;
      e = 1;
      m = '正月';
    } else {
      year = between > 0 ? year : (year - 1);
      yearMonth = this.lunarYearMonths(year);
      leapMonth = this.leapMonth(year);
      between = between > 0 ? between : (this.lunarYearDays(year) + between);
      for (var i = 0; i < 13; i++) {
        if (between == yearMonth[i]) {
          t = i + 2;
          e = 1;
          break;
        } else if (between < yearMonth[i]) {
          t = i + 1;
          e = between - ((yearMonth[i - 1]) ? yearMonth[i - 1] : 0) + 1;
          break;
        }
      }

      m = (leapMonth != 0 && t == leapMonth + 1)
        ? ('闰'.this.chineseMonth(t - 1))
        : this.chineseMonth(((leapMonth != 0 && leapMonth + 1 < t) ? (t - 1) : t));
    }
    lunarArray.push(year, t, e); //年 月 日
    lunarArray.push(this.lunarYear(year),
      this.zodiacYear(year),
      m,
      this.chineseNumber(e)); //天干地支年 生肖年 月份 日
    lunarArray.push(leapMonth); //闰几月
    return lunarArray;
  },
  //中文月份
  chineseMonth: function (month) {
    var monthHash = ['', '正月', '二月', '三月', '四月', '五月', '六月', '七月', '八月', '九月', '十月', '冬月', '腊月'];
    return monthHash[month];
  },
  //中文日期
  chineseNumber: function (num) {
    var dateHash = ['', '一', '二', '三', '四', '五', '六', '七', '八', '九', '十'];
    if (num <= 10) {
      res = '初' + dateHash[num];
    } else if (num > 10 && num < 20) {
      res = '十' + dateHash[num - 10];
    } else if (num == 20) {
      res = "二十";
    } else if (num > 20 && num < 30) {
      res = "廿" + dateHash[num - 20];
    } else if (num == 30) {
      res = "三十";
    }
    return res;
  },
  //转换农历
  toLunar: function (year, month, day) {
    var yearData = this.lunarInfo[year - this.MIN_YEAR];
    if (year == this.MIN_YEAR && month <= 2 && day <= 9) {
      return [1891, 1, 1, '辛卯', '兔', '正月', '初一'];
    }
    return this.lunarByBetween(year, this.betweenSolarDays(year, month, day, yearData[1], yearData[2]));
  },
  //转换公历
  //@param year  阴历-年
  //@param month 阴历-月，闰月处理：例如如果当年闰五月，那么第二个五月就传六月，相当于阴历有13个月
  //@param date  阴历-日
  toSolar: function (year, month, day) {
    var yearData = this.lunarInfo[year - this.MIN_YEAR];
    var between = this.betweenLunarDays(year, month, day);
    var ms = new Date(year + "-" + yearData[1] + "-" + yearData[2]).getTime();
    var s = ms + between * 24 * 60 * 60 * 1000;
    var d = new Date();
    d.setTime(s);
    year = d.getFullYear();
    month = d.getMonth() + 1;
    day = d.getDate();
    return [year, month, day];
   
  },
 
};

module.exports = {
  Lunar: Lunar
}